Huh weird. I didn’t get a notification for this reply.
Anyway, how can you tell? I always thought butcherbirds were brown and white, magpies black and white. The colour balance might make it a bit unclear here, but this guy was definitely black, as was his friend.
Butcher birds are generally smaller, have a different pattern to their colours, and are a bit different in their vocalisations. Magpies tend to warble, whereas Butcher birds generally have a distinct series of tones (that varies a bit around the country). They also tend to hop more than walk - much shorter legs. The beak is a tiny bit different to a magpie too.
The adults are black and white, but the juveniles are usually light grey and white.
The noisy mynahs tend to be a bit more paranoid around Butcher birds too. Maggie's are less likely to actively hunt them. ;)
If you hear a bunch of mynahs going off in a group, it'll most likely be a snake, an owl, or one of these guys.